Instantaneous Fuel Economy (IFE)

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

IFE is calculated using the equation: IFE = Distance/Fuel Used.

Distance = The accumulated distance travelled for the last 2 seconds
Fuel = The accumulated fuel delivered for the last 2 seconds

The IPC calculates IFE based on fuel information message from the ECM. The distance information is calculated by the IPC using the vehicle speed information from the ECM. These values are retained during ignition OFF and can be changed between English and Metric units by accessing the DIC trip/fuel information switch. The IFE display cannot be reset.